+1 to 'Technical' (Math, Decision Theory, Physics, etc)
+1 to promotion from all subreddits
+1 to Main as "Best of", or just getting rid of Main.
+1 to MIRI/FAI/Singularity stuff as a separate subreddit from EA stuff
Also, several historical posts have spanned multiple topics - some thought to a solution to this would be useful (this is the only reason that I might support keeping Main.)
The distinction between "Rationality theory" and "Rationality Practice" is what I think most people are getting at with Life improvement/Self-Improvement/Instrumental Rationality/Applied Rationality, regardless of the technical uses of those terms.
Another option is Links as a separate subreddit - the community norm here of prefacing with 'LINK:' is great, so an extension to a subreddit would be natural. Same goes for meetup announcements.
Less Wrong is based on reddit code, which means we can create subreddits with relative ease.
Right now we have two subreddits, Main and Discussion. These are distinguished not by subject matter, but by whether a post is the type of thing that might be promoted to the front page or not (e.g. a meetup announcement, or a particularly well-composed and useful post).
As a result, almost everything is published to Discussion, and thus it is difficult for busy people to follow only the subjects they care about. More people will be able to engage if we split things into topic-specific subreddits, and make it easy to follow only what they care about.
To make it easier for people to follow only what they care about, we're building the code for a Dashboard thingie.
But we also need to figure out which subreddits to create, and we'd like community feedback about that.
We'll probably start small, with just 1-5 new subreddits.
Below are some initial ideas, to get the conversation started.
Idea 1
Idea 2